SELECT to_char(4194303*value,'999,999,999,999') MAX_BYTES, to_char(trunc(4194303*value/1024),'999,999,999')||' Kb' MAX_KB, to_char(trunc(4194303*value/1024/1024),'999,999')||' Mb' MAX_MB FROM v$parameter WHERE name='db_block_size'; For convenience the table below shows the maximum sizes for common DB_BLOCK_SIZES: DB_BLOCK_SIZE Max Mb value to use in any command ~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~..